Science & Mathematics - 16 October 2007

Submarines can dive from the surface of the water to depths of up to 1,200 feet, then can rise to the surface again, but why can they do this over and over again? When they put water in the compartments to sink the sub, where does the air go? When they pump out the compartments to rise to shallower depths, where does the air come from? After all, they are under water. So, how is a submarine able to do all of this?

Also, can anyone help me find a diagram from a website that explains all of this?

2007-10-16 15:35:31 · 1 answers · asked by Sarah S 3 in Physics

2007-10-16 15:34:59 · 10 answers · asked by JulieG 1 in Mathematics

steam=48 mast=44 tea= 27 sea=22 and stem =36

2007-10-16 15:34:08 · 2 answers · asked by John & Amy H 1 in Mathematics

Most Fundamentalist Islamic governments are against anything advanced but they do bend their rules a bit and except guns.... Would they bend their rules to drill oil faster?

2007-10-16 15:33:45 · 5 answers · asked by Anonymous in Geography

Last bit of help needed, both are for the range [0, 2pi] (1 rev of the circle)

Solve (A = Angle)

cscA = -3.0

And in an equation

-2 = cos^2A - 3cosA

2007-10-16 15:33:37 · 1 answers · asked by Anonymous in Mathematics

Math Help please

2007-10-16 15:29:36 · 1 answers · asked by Snoopy Baby 1 in Mathematics

i have been taking lasix 40 mg when i have to take a piss test and pass everytime, my ? is can the labs detect lasix in ur system and how long does it pop up after the urine test has been taken and sent to employer stating you passed ur drug screen?

2007-10-16 15:28:51 · 8 answers · asked by Anonymous in Medicine

A bullet accelerates at 6.9 x 104 m/s2 from rest as it travels the 0.80 m of the rifle barrel. How long was the bullet in the barrel? What was the bullet's velocity as it left the barrel?

2007-10-16 15:28:34 · 1 answers · asked by Anonymous in Physics

help.

2007-10-16 15:25:10 · 5 answers · asked by Anonymous in Earth Sciences & Geology

What is the source of energy for plants?

A) the Sun
B) carbon dioxide
C) water
D)oxygen

2007-10-16 15:24:40 · 10 answers · asked by Anonymous in Botany

Find the minimum and maximum values of the objective function subject to the given constraints.

Objective Function: C = 3x + 4y

Constraints: x >= 0, y >= 0, x + y = 5

I am real confused about this stuff, can someone explain this step by step please.......

2007-10-16 15:23:57 · 2 answers · asked by ShaZ 1 in Mathematics

Also the schedule..what days & times it comes on EST and what it's about mostly. Thanks. I might check it out.

2007-10-16 15:22:30 · 5 answers · asked by Deenie 6 in Paranormal Phenomena

Since more than 90% of icebergs and ice caps are actually under water even thought they look big from the outside, why is it that if they melt the water level increases?

when ice forms water expands. because of the oxygen. (kind of like when u put a bottle of water in a freezer for too long, it explodes)

so if that ice were to melt it would in fact take up less room would it not?
then wouldnt water levels be decreasing?

2007-10-16 15:19:56 · 8 answers · asked by Anonymous in Earth Sciences & Geology

I needed to know what does water pollution do to the living things in the ocean. Like, how does the pollution effect the ocean..the organisms living inside...and the surroundings?
Thank you very much for your help!

2007-10-16 15:18:47 · 3 answers · asked by Anonymous in Earth Sciences & Geology

1. The following table shows the fnc: G=f(t)
t 1987, 1990, 1993, 1996 ,1999
f(t) 53, 70, 73, 74, 81
(the numbers correspond to their respective years.)

Estimate f ' (1999).
Then,
Use the estimated value of f ' (1999) to estimate f (2005).


Please tell me how to set-up and solve this problem.
Thanks!

2007-10-16 15:16:44 · 1 answers · asked by Anonymous in Mathematics

This characteristic behavior of oil and water is of critical importance for living things, determining many properties of the cell. Can you explain how?

2007-10-16 15:16:03 · 1 answers · asked by Anonymous in Biology

A car moving with a constant acceleration covers the distance between two points 60 m apart in 6.0 s. Its velocity as it passes the second point is 15 m/s. How far behind the first point was the car at rest?

2007-10-16 15:15:40 · 1 answers · asked by Anonymous in Physics

2007-10-16 15:14:51 · 4 answers · asked by JulieG 1 in Mathematics

A basketball player achieves a hang time of 0.517 seconds while dunking a ball. The acceleration of gravity is 9.8 m/s/s
What vertical height will he attain?

2007-10-16 15:14:39 · 1 answers · asked by Zubin S 1 in Physics

Kilowatt /hr conxumptio of: ff attached to a 500VA regulator
1 110 v 60 w TV..1 Dell laptap pc 110-240 V w/60 W adapter
1 DSL modem 220V w/adapter
thank ypu

2007-10-16 15:13:56 · 3 answers · asked by Ricardo S 1 in Engineering

2007-10-16 15:13:52 · 2 answers · asked by ......//;' 4 in Chemistry

im have to solve these (w/ answers between 0 and 2pi) using identities, and i know them but after applying them i keep ending up stuck with an equation i cant solve...

these are the questions:
a) 2 csc^2x = 3 cot^2x - 1
b) sin ^2x + sin x - 1 = 0
c) 3 cosxcotx + 7 = 5 cscx
d) 2 cos^2x - cos x = 2 - secx

can anyone help with any of them?

2007-10-16 15:13:14 · 1 answers · asked by Mitzy D 1 in Mathematics

The temperature of the sun varies from 10,900 f on the surface to 27 billion f at its core. WRITE THESE TEMPERATURES IN SCIENTIFIC NOTATION


P.S. Who ever gets it right gets best answer and i will post another so you can get 20points

2007-10-16 15:12:28 · 6 answers · asked by Cookie 2 in Mathematics

tried researching, but didn't really get it.

2007-10-16 15:11:27 · 8 answers · asked by zzzzgigi 2 in Other - Science

2007-10-16 15:10:08 · 1 answers · asked by Angelica S 2 in Medicine

2007-10-16 15:10:08 · 2 answers · asked by lecaris w 1 in Engineering

Also, are there any other theories of how the universe was created?
And the Big Crunch theory is the most popular theory for 'the end'. But do we know for sure that the universe is going to collapse into itself (like penrose and hawking proved and not like Einstein said that it 's gonna miss itself and expand once again) and not keep on expanding and eventually fall apart etc. ?
And if the Big Crunch does occur what do u think will happen?
(facts, personal theories)

2007-10-16 15:09:29 · 14 answers · asked by zonda 2 in Astronomy & Space

2007-10-16 15:08:43 · 3 answers · asked by doeboi4ever 1 in Mathematics

Some of us really are interested in hearing about your experiences. I know there's a site we can go to for this, but it seems different when it's someone you kinda know...
THANKS !!

2007-10-16 15:05:59 · 14 answers · asked by Deenie 6 in Paranormal Phenomena

it came up on the practice test for the PSAT.

here's the question.
How many 3-digit positive integers can be formed using the digits 2 3 4 5 6 7 and 8 if the units digit is 2 and no integer is repeated within an integer?

2007-10-16 15:00:47 · 4 answers · asked by Jillian 2 in Mathematics